The wife of a would-be suicide bomber who failed to tell police of his plans for “carnage and mass murder” has won a reduction in her 15-year prison sentence.

Muslim convert Yeshi Girma, 32, who knew of Hussain Osman’s plot to kill innocent Tube passengers on July 21, 2005 and could have stopped it going ahead, had her jail term cut to 11 years and 9 months by the Court of Appeal.

Yeshi Girma, wife of a would-be suicide bomber, has won a reduction in her 15-year jail term

Yeshi, the mother of Osman’s three sons, helped him flee to Brighton before he took a Eurostar to Paris and ended up in Rome, where he was arrested.

She and her brother Esayas Girma and sister Mulu Girma, whom she enlisted to help her escape plan, all had conviction appeals rejected by judges in London, but the trio won cuts in their sentences.

Esayas and Mulu each had their ten-year prison terms halved to five years.

Yeshi was found guilty at the Old Bailey last June of having information about terrorism and failing to disclose it “without reasonable excuse”.

She and Esayas, both from Stockwell, south London, and Mulu, from Brighton, were all found guilty of assisting an offender and failing to disclose information about Osman’s involvement in the July 21 attacks.

It was only the botched bomb-making of Osman and his fellow terrorists that saved a repeat of the carnage wreaked on July 7, two weeks before – 52 people were killed and hundreds injured when four suicide bombers blew up parts of the London transport network.

The July 21 plotters tried to detonate rucksack bombs packed with high explosives, hydrogen peroxide and chapati flour, on Tubes at Shepherd’s Bush, Warren Street and Oval stations and on a bus at Shoreditch High Street. But each device failed to explode.

Just over half an hour after his failed attack on Shepherd’s Bush Tube station, Osman was on the phone to his wife to set in motion an escape plan. Osman was later jailed for life with a minimum term of 40 years for conspiracy to murder.